Blizzard is banning Linux users from the game claiming they are either trying to get around the security in place of the game or are cheating. Linux users affected are saying all they are running is a Wine program (lets them use Windows to play the game).
Not all Linux users are getting banned though and anyone who has been affected was also tested for false positives as part of their appeal process.
http://www.escapistmagazine.com/news...of-Unfair-Bans